Nielsen Data Engineer interview questions

how spark application works? hadoop architecture? partition and bucketing? colasce and repartition ? spark-submit? client mode vs cluster mode? optimizations in sprk? aqe, repartition, salting how to handle data skewness? how to identify? replace 2nd occurance of char with # count no/. occurance of element in list rank and dense rank window functions emp_id Department Salary 1 A 10 2 B 30 3 C 40 4 C 60 5 B 70 6 C 90 7 A 100 8 A 30